Bogert



March 22, 1955 BOGERT CARRIAGE-FEEDING AND RETURNING MECHANISM FOR LISTING BUSINESS MACHINES Filed Sept. 21, 1955 INVENTOR THURE BOGE R T United States Patent CARRIAGE FEEDING AND RETURNING MECH- ANISM FOR LISTING BUSINESS MACHINES Thure Bogert, Malmo, Sweden, assignor to Aktiebolaget Addo, Malmo, Sweden, a corporation of Sweden Application September 21, 1953, Serial No. 381,197

Claims priority, application Sweden June 11, 1953 4 Claims. (Cl. 197-66) This invention relates to a carriage feeding and returning mechanism for listing business machines.

An object of the invention is to provide a mechanism of this type that fulfils the following requirements: It shall start the carriage quietly and without jerks, move 1t rapidly and noiselessly, retard it rapidly and stop it softly and without shocks in an exactly correct, predetermined pos1- tion.

Another object of the invention is to provide a screwoperated mechanism of this type which perm1ts scre w operation of the paper carriage of business machines in both directions whereby the feeding and returning movements will take place smoothly and without shocks simultaneously as the greatest possible speed 18 obtained for the returning movement.

The invention thus relates to a carriage feeding and returning mechanism in listing business machines comprising a listing machine, e. g. a listing calculatlng machine, driven by driving means, a paper carriage which 18 movable to different working positions by driving means in the form of cooperating screw and nut means, and a power drive which can be connected with the driving means of the machine proper and of the paper carriage, and the characterising feature of the invention is that the power drive is reversibly rotatable and adapted upon rotation in one direction to drive the driving means of both the machine and the paper carriage, but upon rotation m the opposite direction to be automatically released from the driving means of the machine proper.

Further features and advantages of the invention wlll become apparent from the following description, reference being bad to the accompanying drawings illustrating a preferred embodiment of a mechanism according to the invention. in the drawings:

Fig. 1 is a rear view of part of a bookkeeping machine which is equipped with a carriage feeding and returning mechanism according to the invention, certain details being shown in section.

Fig. 2 shows a clutch included in the mechanism, and the associated control means.

Fig. 3 shows a dog cooperating with the clutch shown in Fig. 2.

Fig. 4 shows an electric wiring diagram.

The bookkeeping machine illustrated in Fig. 1 of the drawings comprises a frame 1 on which a paper carriage is reciprocatable transversely of the machine. The paper carriage is diagrammatically shown as comprising two end wall members 2 and a transverse rod 3 interconnecting said end wall members. Between the members 2 there also extends a bar 4 on the upper side of which tabs 5 are preferably adjustably mounted, while abutments 6 and 7 are preferably adjustably mounted at the lower side of said bar 4.

An electric motor 8 is mounted in the frame 1 for driving the driving means for the paper carriage and the bookkeeping machine proper which are described in the following. A one-way clutch is secured to the drive shaft 9 of the motor 8. As shown as an example, the clutch comprises a cup-shaped member 10 secured to the shaft 9 and surrounding with clearance a wheel 11 which is freely rotatably mounted on the shaft 9. In a known manner the wheel 11 has wedge-shaped recesses in its periphery, in which there are mounted rollers 12 which are clamped in a known manner between the cup-shaped member 10 and the wheel 11 when the motor shaft 9 rotates in one direction so that the wheel 11 is caused to participate in the rotation, but lie loose in the wide portions of the wedge-shaped recesses when the shaft 9 rotates in the other direction so that the wheel 11 then is not brought along in the rotation. The wheel 11 is integral with a pinion 13 which is in mesh with a gear 15 mounted on a shaft 14 in the frame 1 and forming the driving means of the bookkeeping machine proper. Said gear 15 can be connected in a manner known and not shown in detail with the main drive shaft of the machine to drive the machine in operating cycles when a key releasing operating cycles of the machine is depressed by the operator and the motor thereby rotates in the direciign igsulting in an engagement of the one-way clutch The drive shaft 9 of the motor is non-rotatably secured to one end of a resilient sleeve 16 in the other end of which there is secured a shaft 18 mounted in the frame 1 by means of ball bearings 17. The sleeve 16 forms a shock-absorbing resilient coupling between the shafts 9 and 18. Fixed to the shaft 18 is a pulley 19 which by means of a cable 20 drives a pulley 21 which is freely rotatable on the end stud 22a of a screwthreaded spindle 22. The stud 22a is rotatably but nondisplaceably mounted by means of ball bearings 23 and 24 in brackets on the frame 1, and at the right-hand end (not shown in Fig. 1) the screw-threaded spindle 22 is rotatably but non-displaceably mounted in the machine frame in a manner not shown by means of another end stud. The spindle 22 extends in parallel with the rods 3 and 4 of the carriage and thus in parallel with the direction of motion of the carriage. A nut 25 secured to the bar 4 meshes with the threaded portion of the spindle 22. The screw-threaded spindle 22 and the nut 25 form the driving means of the paper carriage which displace the carriage transversely of the machine when the screwthreaded spindle 22 is caused to rotate in the manner described in the following.

Projecting from one face of the cable pulley 21 are dogs 26 (Figs. 1 and 3) which, for driving the screwthreaded spindle 22, are adapted to engage with a lug 27 on one end of a two-armed pawl 28. Said pawl is mounted for pivotment about a pivot 29 on a disk 30 secured to the stud 22a of the screw-threaded spindle. The pawl 28 is normally held in the position of pivotrnent shown in Fig. 2 relatively to the disk 30 with the pawl bearing against the stud 22a by a pull spring 31 which is interposed between a spring attachment 32 on the disk 30 and the end of the pawl remote from the lug 27, which end is provided with a lug 33. Said lug 33 extends laterally over a recess 34 provided in the disk 30. A hook 35 on a two-armed lever 36 can engage in this recess 34. The lever 36 is mounted on a pivot 37 in the frame 1, and a pull spring 38 tends to swing the hook 35 towards the disk 30. Such a swinging movement of the lever 36 can be counteracted by one end of a twoarmed lever 39 which is pivotally mounted in the frame 1 about a pivot 40 and which is influenced by a pull spring 41 which is able to hold the hook 35 lifted away from the disk 30 in the Fig. 2 position against the action of the spring 38. At the end remote from the lever 36 the lever 39 is fork-shaped and in the fork prongs there are provided arcuate slots 42 in which the shaft of a roller 43 is mounted. The spring 41 holds the roller 43 in bearing contact with the bar 4. A leaf spring 44 fixed on the lever 39 tends to maintain the shaft of the roller 43 at the lower end of the arcuate slots 42 in the lever 39, which end is directed away from the lever 36.

A cam disk 46 with a cam 47 is mounted on a shaft 45 (Fig. 2) which is arranged in the bookkeeping machine proper and makes one revolution during each operating cycle of the bookkeeping machine proper. Pivotally mounted about a pivot 48 secured in the frame 1 is a two-armed lever 49 one end of which carries a roller 50 and the other end of which is connected with a pull spring 51 anchored to the frame and holding the roller 50 applied against the cam disk 46. The end of the lever 49 connected with the spring 51 lies directly above one end of the lever 36 so that the hook 35 of the lever 36 is lifted away from the disk 30 when the cam 47 passes below the roller 50 at the end of an operating cycle of the bookkeeping machine proper.

A pole reverser 52 is secured to the frame 1. Its control arm 53 lies in the path of motion of the abutments 6 and 7 on the bar 4 so that the pole reverser is shifted from one coupling position to the other one when, during the movement of the carriage, the abutments 6 and 7 meet the arm 53. Furthermore, a switch 54 is mounted on the frame 1. Said switch is operable by means of the lever 39 so as to be closed when the roller 43 of the lever 39 bears against the bar 4, but to be open when the roller 43 is on the top of some of the tabs on the bar 4, the lever 39 being thereby swung counter-clockwise as viewed in Fig. 1. As usual in machines of this type there is provided a switch 55 which is closed upon depression of some key releasing an operating cycle of the bookkeeping machine proper, and which is opened again at the end of the operating cycle. Fig. 4 shows a wiring diagram from which it can be seen how the pole reverser 52 and the switches 54 and 55 are connected in the circuit of the motor 8. It is apparent from Fig. 4 that the switches 54 and 55 are connected in parallel in one feed line leading to the motor 8. When one or both of the switches 54 and 55 are closed the field winding 8a and the armature 8b of the motor are supplied with electric current from a source of current connected to terminals 56 and 57. The ends of the field winding 8a are invariably connected to the terminals 56 and 57, while the brushes of the armature 8b are reversibly connected to the terminals 56 and 57 by means of the pole reverser 52, as is apparent from Fig. 4. By shifting the pole reverser 52 the direction of rotation of the motor 8 can thus be reversed. If desired, in connection with the reversal of the direction of rotation of the motor it is possible to arrange a changeover mechanism between two speed governors so that the motor will rotate more rapidly in one direction than in the other one.

For a description of the function of the carriage feeding and returning mechanism it should first be assumed that the parts occupy the Fig. 1 and Fig. 2 positions with the pole reverser 52 in such a position that the motor rotates in the direction for driving the carriage in the feeding direction, i. e. from the left towards the right in Fig. 1. The roller 43 of the lever 39 bears against the bar 4 and the spring 41 maintains the lever 39 in such a position that it holds the hook 35 of the lever 36 lifted away from the disk 30 and maintains the switch 54 closed so that the motor 8 rotates in one direction. One of the dogs 26 of the cable pulley 21 consequently bears against the lug 27 of the pawl 28, thus taking along the disk 30 so that the screw-threaded spindle 22 rotates in one direction whereby the nut 25 is moved on the screw-threaded spindle 22, taking along the carriage in the feeding direction. When a tab 5 reaches the roller 43, the shaft of the roller is urged towards the end of the arcuate slots 42 remote from the lever 36 whereby the lever 39 is forced to swing counter-clockwise as the roller 43 climbs up to the top of the tab. When the top is reached the lever 39 has been swung so far counter-clockwise that the switch 54 has shut off the current supply to the motor 8 so that it stops, and simultaneously the lever 39 has allowed the spring 38 to swing the hook 35 of the lever 36 into hearing contact with the disk 30. The hook 35 slides on the periphery of the disk 30 and meets the lug 33 of the pawl 28 which is thereby swung counter-clockwise as viewed in Fig. 2 relatively to the disk 30 whereby the lug 27 is swung inwardly towards the pivot 22a away from its engagement with either of the dogs 26 so that the driving connection between the motor and the screw-threaded spindle 22 is interrupted. By the action of inertia the disk 30 continues to rotate somewhat, the hook falling into the recess 34 of the disk 30 and locking the screwthreaded spindle 22 against further rotation. In this way the paper carriage has been stopped in a position where the bookkeeping machine is to perform an operating cycle and list on a paper sheet carried by the carriage. The operator can now start such an operating cycle of the bookkeeping machine by depressing a key releasing an operating cycle of the bookkeeping machine proper. Upon depression of sucha key, on one hand the switch 55 will be closed so that the motor 8 is started and on the other the main drive shaft of the machine will be connected to the gear 15 which with the direction of rotation in question of the motor 8 is driven by the motor through the one-way clutch 1012 so that the machine carries out the desired operating cycle. Near the end of this operating cycle the cam 46 will have rotated so far clockwise from the Fig. 2 position that the cam 47 lifts the roller 50 against the action of the spring 51, thereby swinging the lever 49 into bearing contact with the lever 36 which is thereby swung in such a way that the hook 35 is lifted out of engagement with the disk 30. By this lifting of the hook 35 the pawl 28 also has the possibility of swinging back to the Fig. 2 position under the action of the spring 31 whereby the lug 27 is swung into engagement with one of the dogs 26 of the pulley 21 so that the screwthreaded spindle 22 is again rotated and begins to move the carriage to the right as viewed in Fig. 1. At this movement the roller 43 rolls down from the top of the tab 5, the lever 39 being swung clockwise as viewed in Fig. 1 and retaining the lever 36 with the hook 35 swung away from the disk 30 also after the cam 47 has passed the roller 50 entirely. At the end of the operating cycle of the bookkeeping machine proper the the cam disk 46 again stops in the Fig. 2 position and the switch 55 is moved into open position, but the motor 8 nevertheless continues to rotate since the switch 54 has been closed by the lever 39. The paper carriage will thus continue its movement to the right as viewed in Fig. 1 until the next tab 5 meets the roller 43 when the operation already described is repeated. When the paper carriage reaches its right-hand end position in Fig. 1 the abutment 6 meets the control arm 53 of the pole reverse 52, shifting it in such a way that the direction of rotation of the motor 8 is reversed. As already mentioned, a changing over to another speed governor for the motor can then take place so that the rotation speed of the motor is increased to obtain a rapid returning of the carriage. As the screwthreaded spindle 22 now rotates in the opposite direction, the carriage will be displaced from the right to the left as viewed in Fig. 1. When during this returning movement of the carriage the tabs 5 in turn pass the roller 43, this does not result in any stoppin of the carria e in the manner described since the respective tab now moves the shaft of the roller in the arcuate slots 42 first towards the lever 36 and then upwardly in said slots against the action of the weak leaf spring 44 so that the tabs 5 can pass below the roller 43 without swin ing the lever 39. As a result, the paper carriage will move to its extreme left-hand end position in Fig. 1 in which position the abutment 7 shifts the pole reverser 52 in such a way that the motor again starts rotatin in the direction for moving the carriage in the feeding direction, i. e. from the left to the right in Fig. 1. This displacement of the carriage in the feeding direction proceeds until the first tab 5 meets the roller 43 and causes the carriage to stop.

The mechanism described above and shown in the drawings fulfiils the requirements mentioned in the introduction. It starts quietly and without jerks since the resilient coupling 16 is arran ed between the motor 8 and the screw-threaded spindle 22, a coupling which prevents shocks which wou d therwise inevitablv occur. The screw-threaded spindle 22 has a very small flywheel mass and is accelerated very rapidly. Having been accelerated, the carria e moves at a uniform speed. As soon as the screw-threaded spindle is disconnected from the pulley 21 and decreases its speed. the nut 25 will increase its friction a ainst the screw-threaded spindle by the action of the inertia of the paper carriage. Since the nut 25 is self-locking on the screw-threaded spindle, this contributes to retarding the carriage rapidly and without shocks since the screw-threaded spindle with its small masses has no ap reciable flywheel action.

Of course. the invention must not be considered as restricted to the embodiment described above and shown in the drawings, for many modifications mav be resorted to within the scope of the inventive idea defined in the appendant claims. It sh uld be observed especiallv that a reversing gear controlled by the abutments 6 and 7 and driven by a motor always rotating in one and the same direction can be substituted for the reversible motor shown. The nut can be made rotatable instead of the screwthreaded spindle.

What I claim and desire to secure by Letters Patent is:

1. In a machine of the character described the combination comprising a frame, a rotatab e main driving member mounted in said frame for driving calculating means forming part of the machine. a paper carriage forming part of tvpe-writing means formin part of the machine, said carria e being mounted on said frame and movable transversely thereof, a screw and a nut thereon for feeding said carriage into different writing positions and for returning it into normal position, one of said screw and nut being rotatably mounted in said frame and the other being mounted on said carriage, reversible driving means for driving both said main driving member and said rotatable one of said screw and nut, means connecting said rotatable one of said screw and nut to said reversible driving means so that the direction of rotation of said rotatable one of said screw and nut will be reversed on reversal of the direction of rotation of said reversible driving means, means operating under the control of the movements of said carriage for effecting reversal of said reversible driving means, and means so connecting said main driving member to said reversible driving means that said main driving member will bedriven by said reversible driving means on rotation thereof in one direction only but not in the other.

2. In a machine of the character described the combination comprising a frame, a rotatable main driving member mounted in said frame for driving calculating means forming part of the machine, a paper carriage forming part of type-Writing means forming part of the machine, said carriage being mounted on said frame and movable transversely thereof, a screw and a nut thereon for feeding said carriage into different writing positions and for returning it into normal position, said screw bieng rotatably and axially non-displaceably mounted in said frame, said nut being mounted on said carriage, a reversible motor for driving both said main driving member and said screw, means so connecting said screw to said reversible motor that the direction of rotation of said screw will be reversed on reversal of the direction of rotation of said reversible motor, means operating under the control of the movements of said carriage for effecting reversal of said reversible motor, and means inincluding a one-way clutch connecting said main driving member to said reversible motor so that said main driving member will be driven by said reversible motor or; rotation thereof in one direction only but not in the ot ler.

3. The combination as claimed in claim 2, and a reverser for the reversible motor, and abutment means on said carriage for operating said reverser to determine end positions of said carriage.

4. The combination as claimed in claim 2, and a coupling forming part of said means connecting said screw to said reversible motor, abutments on said carriage, and mechanism operable by said abutments for controlling said coupling.

References Cited in the file of this patent UNITED STATES PATENTS 836,932 Kunath Nov. 27, 1906 2,411,723 Hausman Nov. 26, 1946 2,439,470 Jackson Apr. 13, 1948 2,597,162 Mehan et al. May 20, 1952 

